By about how much earlier or later can the average person shift her sleep-wake cycle without negatively affecting her alertness or activity levels?
A) 1 hour
B) 90 minutes
C) 2 hours
D) 3 hours

Question

Quizplus · Accepted Answer

The Answer of By about how much earlier or later can the average person shift her sleep-wake cycle without negatively affecting her alertness or activity levels?
A) 1 hour
B) 90 minutes
C) 2 hours
D) 3 hours

By About How Much Earlier or Later Can the Average